The Soo Locks
On June 18, 1855, the first ship passed through the Soo Locks, located on the St. Mary’s River between Lake Superior and Lake Huron. Today there are four locks, and an average of 10,000 ships pass through them each year.
Technology
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Birth of the Laser – International Day of Light
On May 16, 1960, Theodore Maiman fired up a device that turned a flash of light into something sharper, brighter, and far more useful. His first working laser later gave May 16 its place as the International Day of Light, a yearly reminder of how light-based science changed medicine, communications, industry, and daily life.
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Patent Act of 1790
On April 10, 1790, President George Washington signed the Patent Act of 1790 into law, creating a formal system to protect new inventions in the young United States. In just a few paragraphs, the new nation set rules that would shape American innovation for generations.
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Samuel Morse Dies
On April 2, 1872, telegraph inventor Samuel Morse died, closing the life of a man whose work helped make near-instant communication possible. His system turned electricity into language, allowing messages to travel across vast distances in seconds rather than days.
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Happy National Doctors’ Day
On March 30, 1842, Dr. Crawford W. Long used ether during surgery for the first time, allowing a patient to undergo a procedure without pain. That moment is now honored each year as National Doctors’ Day, recognizing both the event and the physicians who continue to apply medical science in practice.
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First Commercial Safety Elevator
On March 23, 1857, the first commercial safety elevator was installed in New York City by the Otis Company. This new design solved a long-standing danger and made it practical for people—not just cargo—to move safely between floors in tall buildings.
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Eli Whitney Patents Cotton Gin
On March 14, 1794, Eli Whitney received a patent for his cotton gin nearly five months after submitting his application. The machine would dramatically speed up cotton processing and reshape the economy of the American South.
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Pioneer 10 is Launched
On March 2, 1972, Pioneer 10 lifted off from Cape Canaveral, Florida. It became the first spacecraft to travel beyond the outer planets and eventually the first human-made object to head out of the Solar System.
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First Submarine to Circle the Globe
On February 24, 1960, the US Navy submarine USS Triton slipped beneath the surface to begin the first fully submerged circumnavigation of the globe. The daring departure marked the start of a 60-day underwater journey that would prove just how far nuclear submarine technology had advanced during the tense years of the Cold War.
